Euornithes (from Greek ευόρνιθες euórnithes meaning "true birds") is a natural group which includes the most recent common ancestor of all avialans closer to modern birds than to the enantiornithines.

This group was defined in the PhyloCode by Juan Benito and colleagues in 2022 as "the largest clade containing Vultur gryphus, but not Enantiornis leali and Cathayornis yandica".

[4] It was first defined as a clade in 1998 by Paul Sereno, who made it the group of all animals closer to birds than to Enantiornithes (represented by Sinornis).

The cladogram below follows the results of a phylogenetic analysis by Lee et al., 2014:[5] †Enantiornithes †Archaeorhynchus †Jianchangornis †Zhongjianornis †Chaoyangia †Schizooura †Patagopteryx †Vorona †Ambiortus †Songlingornithidae †Hongshanornithidae †Apsaravis †Gansus †Hollanda †Ichthyornis †Hesperornithes †Limenavis Aves (modern birds) The following cladogram below follows the results of a phylogenetic analysis by Pei et al., 2020:[6] † Xiaotingia † Aurornis † Eosinopteryx † Anchiornis †Archaeopteryx †Sapeornis †Jeholornis †Jixiangornis †Confuciusornis † Enantiornithes †Patagopteryx †Hongshanornis †Yanornis †Yixianornis †Apsaravis Ornithurae The following is a list of primitive euornithian genera and those that cannot be confidently referred to any subgroups, following Holtz (2011) unless otherwise noted.

[7] Note that Holtz also included the genera Eurolimnornis and Piksi as euornitheans, though they have since been re-identified as pterosaurs.